CN102141430B - Method and system for wirelessly measuring resonant frequency of sample piece by combination of sound waves and electromagnetic waves - Google Patents
Method and system for wirelessly measuring resonant frequency of sample piece by combination of sound waves and electromagnetic waves Download PDFInfo
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- CN102141430B CN102141430B CN2010106134158A CN201010613415A CN102141430B CN 102141430 B CN102141430 B CN 102141430B CN 2010106134158 A CN2010106134158 A CN 2010106134158A CN 201010613415 A CN201010613415 A CN 201010613415A CN 102141430 B CN102141430 B CN 102141430B
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Abstract
The invention discloses a method and a system for wirelessly measuring the resonant frequency of a sample piece by the combination of sound waves and electromagnetic waves. A single frequency carrier signal generated by an electromagnetic source is converted into electromagnetic waves by an emitting antenna to irradiate the sample piece to be tested; and the electromagnetic waves reflected by the sample piece to be tested are first received by a receiving antenna and then received by a frequency spectrograph. An acoustic frequency signal generated by an acoustic wave source is converted into a high-power and high-directionality acoustic wave beam by an electroacoustic transducer to irradiate the sample piece to be tested, so that the sample piece to be tested generates mechanical vibration. When the frequency of the acoustic waves is equal to the vibration frequency of the sample pipe to be tested, the mechanical vibration amplitude of the sample piece to be tested reaches the highest value. The mechanical vibration of the sample piece to be tested performs amplitude modulation on the electromagnetic waves, so that sidelobes occur on two sides of the carrier in a frequency spectrogram. The sidelobes on two sides of the carrier are observed by the frequency spectrograph, and the acoustic wave frequency corresponding to the maximum amplitude of the sidelobes is the resonant frequency of the sample piece to be tested. In the invention, the resonant frequencies of various samples to be tested can be measured accurately without damaging and contacting the tested sample pieces.
Description
Technical field
The present invention relates to a kind of sound wave and electromagnetic wave collaboration working method and system, especially relate to the method and system of the collaborative wireless measurement exemplar resonance frequency of a kind of sound wave and electromagnetic wave.
Background technology
Resonance frequency is claimed natural frequency again, is meant frequency former owing to composition material of physical system own and physical dimension etc. thereby that have.For a physical system, when the hormetic frequency in the external world was identical with its resonance frequency, this system's forced vibration amplitude was maximum.In general there are a plurality of resonance frequencies in a system (no matter being mechanics, the sound or electronics), and vibration is vibrated relatively difficulty than being easier on other frequency on these frequencies.
Traditional resonant frequency measurement method comprises simple harmonic quantity power excitation method, hammering method and from Zymography etc.There are the risk of damaging tested exemplar in simple harmonic quantity power excitation method and hammering method; And from the Zymography performance difficulty, and only be applicable to the tested sample of ad hoc structure.
Summary of the invention
The object of the present invention is to provide the method and system of the collaborative wireless measurement exemplar resonance frequency of a kind of sound wave and electromagnetic wave,, measure the resonance frequency of various tested samples exactly not damaging, do not contact under the situation of tested exemplar.
The technical scheme that the present invention adopts is:
One, the method for the collaborative wireless measurement exemplar resonance frequency of a kind of sound wave and electromagnetic wave:
The single-frequency carrier signal that electromagnetic wave source produces converts electromagnetic wave into through emitting antenna, the irradiation tested sample; The electromagnetic wave of tested sample reflection is received by frequency spectrograph after receiving antenna receives; Acoustic wave source produces sound signal; Convert high-power, high directivity beam of sound into via electroacoustics transducer, the irradiation tested sample makes tested sample produce mechanical vibration; When the frequency of sound wave equaled the resonance frequency of tested sample, the mechanical vibration amplitude of tested sample was maximum; The mechanical vibration of tested sample produce amplitude modulation(PAM) to electromagnetic wave, make that secondary lobe appears in the carrier wave both sides in the spectrogram; Through the secondary lobe of frequency spectrograph observation carrier wave both sides, pairing frequency of sound wave when the secondary lobe amplitude is maximum is exactly the resonance frequency of tested sample.
Two, the system of the collaborative wireless measurement exemplar resonance frequency of a kind of sound wave and electromagnetic wave:
Comprise electromagnetic wave source, emitting antenna, receiving antenna, frequency spectrograph, acoustic wave source and electroacoustics transducer; Antenna is penetrated in the electromagnetic wave source sending and receiving, converts electromagnetic wave into through emitting antenna, the irradiation tested sample; Frequency spectrograph connects receiving antenna, and the electromagnetic wave of tested sample reflection is received by frequency spectrograph after receiving antenna receives; Acoustic wave source connects electroacoustics transducer, and the single-frequency sound wave beam that converts frequency adjustable via electroacoustics transducer into shines tested sample, makes tested sample produce mechanical vibration.
Described tested sample is arbitrary system or device.
The beneficial effect that the present invention has is:
The present invention implements convenient and simple, not damaging, do not contact under the situation of tested exemplar, measures the resonance frequency of various tested samples exactly.
Description of drawings
Fig. 1 is the theory diagram that the present invention realizes.
Fig. 2 receives electromagnetic spectrogram when not launching sound wave.
When being resonance, Fig. 3 receives electromagnetic spectrogram.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
As shown in Figure 1, comprise electromagnetic wave source, emitting antenna, receiving antenna, frequency spectrograph, acoustic wave source and electroacoustics transducer; Antenna is penetrated in the electromagnetic wave source sending and receiving, converts electromagnetic wave into through emitting antenna, the irradiation tested sample; Frequency spectrograph connects receiving antenna, and the electromagnetic wave of tested sample reflection is received by frequency spectrograph after receiving antenna receives; Acoustic wave source connects electroacoustics transducer, converts single-frequency sound wave beam irradiation tested sample high-power, the high directivity frequency adjustable into via electroacoustics transducer, makes tested sample produce mechanical vibration.
Described tested sample is arbitrary system or device.
A) the single-frequency carrier signal of electromagnetic wave source generation converts electromagnetic wave into through emitting antenna, the irradiation tested sample;
B) electromagnetic wave of tested sample reflection is received by frequency spectrograph after receiving antenna receives.
C) acoustic wave source produces sound signal; Convert beam of sound high-power, high directivity into via electroacoustics transducer, the irradiation tested sample makes tested sample produce mechanical vibration; When the frequency of sound wave equaled the resonance frequency of tested sample, the mechanical vibration amplitude of tested sample was maximum.
D) mechanical vibration of tested sample produce amplitude modulation(PAM) to the electromagnetic wave of reflection, make the carrier wave both sides secondary lobe occur; Through the secondary lobe of frequency spectrograph observation carrier wave both sides, pairing frequency of sound wave when the secondary lobe amplitude is maximum is exactly the resonance frequency of tested sample.
In measuring system of the present invention:
Electromagnetic wave source uses commercial radio-frequency signal source, like the E8267C of Agilent company production.
Emitting antenna and receiving antenna use antennas commonly used such as dipole.
Frequency spectrograph uses commercial spectrum analyzer, like the E4407B of Agilent company production.
The acoustic wave source sound card that uses a computer, the external sound card X-Fi of the USB Surround 5.1 that produces like Creative Company; Perhaps use commercial low frequency signal source, like the 33210A of Agilent company production.
Electroacoustics transducer uses high-power loudspeaker, like favour prestige TN28 and reflector antenna, like centre halfback (JONSA) satellite antenna KU pot face.
Fig. 2 is in the lecture experiment, and the single-frequency electromagnetic wave irradiation of 2.45GHz is to static tested sample the time, by the electromagnetic frequency spectrum of tested sample reflection.Only there is crest in this frequency spectrum at the 2.45GHz place.
Fig. 3 is in the lecture experiment, when 2.45GHz single-frequency electromagnetic wave and 3kHz beam of sound shine on the tested sample simultaneously, by the electromagnetic frequency spectrum of tested sample reflection.This frequency spectrum occurs secondary lobe in the carrier wave both sides of 2.45GHz at a distance of the 3kHz place.The amplitude of this secondary lobe is the maximal value of the different frequency sound wave secondary lobe that can cause, promptly the resonance frequency of the tested sample in the lecture experiment is 3kHz.
The signal work path is following: the single-frequency carrier signal that electromagnetic wave source produces converts electromagnetic wave into through emitting antenna, the irradiation tested sample; The electromagnetic wave of tested sample reflection is received by frequency spectrograph after receiving antenna receives; Acoustic wave source produces sound signal; Convert beam of sound high-power, high directivity into via electroacoustics transducer, the irradiation tested sample makes tested sample produce mechanical vibration; When the frequency of sound wave equaled the resonance frequency of tested sample, the mechanical vibration amplitude of tested sample was maximum; The mechanical vibration of tested sample produce amplitude modulation(PAM) to the electromagnetic wave of reflection, make that secondary lobe appears in the carrier wave both sides in the spectrogram; Through the secondary lobe of frequency spectrograph observation carrier wave both sides, pairing frequency of sound wave when the secondary lobe amplitude is maximum is exactly the resonance frequency of tested sample.
Claims (3)
1. the method for the collaborative wireless measurement exemplar resonance frequency of sound wave and electromagnetic wave, it is characterized in that: the single-frequency carrier signal that electromagnetic wave source produces converts electromagnetic wave into through emitting antenna, the irradiation tested sample; The electromagnetic wave of tested sample reflection is received by frequency spectrograph after receiving antenna receives; Acoustic wave source produces sound signal; Convert high-power, high directivity beam of sound into via electroacoustics transducer, the irradiation tested sample makes tested sample produce mechanical vibration; When the frequency of sound wave equaled the resonance frequency of tested sample, the mechanical vibration amplitude of tested sample was maximum; The mechanical vibration of tested sample produce amplitude modulation(PAM) to electromagnetic wave, make that secondary lobe appears in the carrier wave both sides in the spectrogram; Through the secondary lobe of frequency spectrograph observation carrier wave both sides, pairing frequency of sound wave when the secondary lobe amplitude is maximum is exactly the resonance frequency of tested sample.
2. according to a kind of sound wave of the said method of claim 1 and the system of the collaborative wireless measurement exemplar resonance frequency of electromagnetic wave, it is characterized in that: comprise electromagnetic wave source, emitting antenna, receiving antenna, frequency spectrograph, acoustic wave source and electroacoustics transducer; Antenna is penetrated in the electromagnetic wave source sending and receiving, and the single-frequency carrier signal that electromagnetic wave source produces converts electromagnetic wave into through emitting antenna, the irradiation tested sample; Frequency spectrograph connects receiving antenna, and the electromagnetic wave of tested sample reflection is received by frequency spectrograph after receiving antenna receives; Acoustic wave source connects electroacoustics transducer, and the sound signal that acoustic wave source produces is shone tested sample via the single-frequency sound wave beam that electroacoustics transducer converts frequency adjustable into, makes tested sample produce mechanical vibration.
3. the system of the collaborative wireless measurement exemplar resonance frequency of a kind of sound wave according to claim 2 and electromagnetic wave, it is characterized in that: described tested sample is arbitrary system or device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010106134158A CN102141430B (en) | 2010-12-30 | 2010-12-30 | Method and system for wirelessly measuring resonant frequency of sample piece by combination of sound waves and electromagnetic waves |
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| CN2010106134158A CN102141430B (en) | 2010-12-30 | 2010-12-30 | Method and system for wirelessly measuring resonant frequency of sample piece by combination of sound waves and electromagnetic waves |
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| CN102141430A CN102141430A (en) | 2011-08-03 |
| CN102141430B true CN102141430B (en) | 2012-04-18 |
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| CN102611214A (en) * | 2012-04-06 | 2012-07-25 | 天津工业大学 | EMSR (electromagnetic & mechanical synchronous resonance) electromagnetic energy transmitting and receiving system |
| CN104374462A (en) | 2014-11-17 | 2015-02-25 | 北京智谷睿拓技术服务有限公司 | Vibration information acquisition method and device and user equipment |
| CN104374464B (en) | 2014-11-17 | 2017-10-10 | 北京智谷睿拓技术服务有限公司 | Vibration information acquisition methods and vibration information acquisition device |
| CN104374463B (en) | 2014-11-17 | 2017-10-13 | 北京智谷睿拓技术服务有限公司 | information acquisition method and information acquisition device |
| CN105841798B (en) * | 2016-05-12 | 2019-05-14 | 重庆医科大学 | Highly sensitive hydrophone for sonic detection |
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| JPS5535228A (en) * | 1978-09-02 | 1980-03-12 | Akihiro Fujimura | Observation unit for inside of body using doppler effect of electromagnetic wave and acoustic wave |
| US4930352A (en) * | 1989-03-30 | 1990-06-05 | The United States Of America As Represented By The Secretary Of The Air Force | Reflective membrane optical scintillator |
| JP4059809B2 (en) * | 2003-06-02 | 2008-03-12 | 株式会社小野測器 | Laser Doppler vibrometer |
| US7667827B2 (en) * | 2006-02-01 | 2010-02-23 | General Electric Company | Systems and methods for remote monitoring of vibrations in machines |
| JP5035618B2 (en) * | 2006-12-05 | 2012-09-26 | 独立行政法人理化学研究所 | Detection method and detection apparatus using electromagnetic wave |
| FR2917166B1 (en) * | 2007-06-05 | 2012-04-27 | Toulouse Inst Nat Polytech | METHOD AND DEVICE FOR DETECTING WATER IN AN ALVEOLAR STRUCTURE. |
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Assignee: Jinhua TROQ Electronic Co., Ltd. Assignor: Zhejiang University Contract record no.: 2012330000380 Denomination of invention: Method and system for wirelessly measuring resonant frequency of sample piece by combination of sound waves and electromagnetic waves Granted publication date: 20120418 License type: Exclusive License Open date: 20110803 Record date: 20120613 |
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